LINPACK and
EISPACK are precursors of
LAPACK, dealing with linear systems and eigenvalue problems, respectively.

SuperLU
is a fast implementations of sparse Gaussian elimination for
sequential and parallel computers, respectively.

BEBOP (Berkeley Benchmarking and
Optimization) is a source for automatic generation of high performance
numerical codes, including OSKI,
a system for producing fast implementations of sparse-matrix-vector-multiplication.
(OSKI stands for Optimized Sparse Kernel Interface, and only coincidentally is
also the name of the Cal Bear mascot :) ).